Contents

19 February 2010
Vol 327, Issue 5968

About The Cover

Cover image expansion

COVER "Branching Morphogenesis," an installation made from more than 75,000 interconnected cable zip ties, illustrates the predicted forces generated by human lung endothelial cells as they form networks within an extracellular matrix over time. Winners of the 2009 Science/NSF International Science & Engineering Visualization Challenge are featured in a special section starting on page 945. Image: Jenny E. Sabin; installation: Peter Lloyd Jones, Jenny E. Sabin, Andrew Lucia, Annette Fierro/Sabin+Jones LabStudio, University of Pennsylvania